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Influence of adding graft UHMWPE and nanofillers onto wear resistance of Ultra-High Molecular Weight Polyethylene (UHMWPE) mixture

2012 7th International Forum on Strategic Technology (IFOST), 2012

UHMWPE (Ultra High Molecular Weight Polyethylene) is widely used in the medical application and is a promising structural material for application in mining, chemical, mechanical engineering. Having very low friction coefficient it might be used even instead of metal friction parts but it calls for further increase of its physical mechanical properties. It is one of the very high resistant ...


AC conductivity and dielectric properties modification of UHMWPE by graphene fillers

2016 IEEE International Conference on Dielectrics (ICD), 2016

In this report, a multi-layer functionalized graphene was mixed to UHMWPE. Composite samples with 0.05 wt%; 0.1 wt%; 0.15 wt% and 0.5 wt% of functionalized graphene have been manually mixed. The AC conductivity of these samples was then measured using Broadband Dielectric Spectroscopy (BDS) at low voltage. The measurements were conducted at room temperature, 40 °C, 60 °C and 80 ...


Tribocorrosion performance of Co/UHMWPE composite biocoatings compared to pure co coatings in a simulated physiological solution

2015 E-Health and Bioengineering Conference (EHB), 2015

In this study, comparative investigation of pure Co coatings and Co/UHMWPE (ultra high molecular weight polyethylene) composite biocoatings was carried out to determine the tribocorrosion performance in a simulated physiological solution. The in situ electrochemical technique used for investigation of tribo-electrochemical degradation was the open circuit potential (OCP) measurement performed before, during and after sliding tests. The results show that ...


Ultra high molecular weight polyethylene (UHMWPE): Dielectric strength and space charge characteristics

2013 IEEE International Conference on Solid Dielectrics (ICSD), 2013

In order to replace old insulation systems based on oil-paper, other materials, such as low density polyethylene (LDPE), high density polyethylene (HDPE) and specially, cross-linked polyethylene (XLPE), have been used. Characterization of new polymeric materials potentially useful for HVDC power cables is an interesting research topic to work on. In this paper, one material whose previous applications have been far ...


A study of free radicals in irradiated/aged UHMWPE materials

Proceedings of the 1996 Fifteenth Southern Biomedical Engineering Conference, 1996

UHMWPE bar stock, resin powder and fibers that were irradiated with an electron beam and then stored in air for three years were investigated for long-lived free radicals. Significant concentrations of free radicals were found in all UHMWPE materials. Peroxy radicals are predominant in the UHMWPE materials that are highly accessible to oxygen, while more primary radicals remain in the ...


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  • Influence of adding graft UHMWPE and nanofillers onto wear resistance of Ultra-High Molecular Weight Polyethylene (UHMWPE) mixture

    UHMWPE (Ultra High Molecular Weight Polyethylene) is widely used in the medical application and is a promising structural material for application in mining, chemical, mechanical engineering. Having very low friction coefficient it might be used even instead of metal friction parts but it calls for further increase of its physical mechanical properties. It is one of the very high resistant materials but it is difficult to bond with other substances. One of perspective ways to bond UHMW-PE with filler is its grafting. There is one more interesting approach, when graft UHMWPE is added to UHMW-PE in order to react both with latter and nanofiller. This might be achieved be adding different kind of fillers, in particular nanoscale ones. In this paper we attempted to increase the mixture ability of UHMWE-graft-SMA with Cu, CNF and Al2O3 for enhancing its wear resistance properties and study the changing of hardness after mixing. We employed UHMWPE powder and graft UHMWPE with anhydride and carboxyl functional groups realized by modification of the polymers in reacting gases (UHMWPE-g-SMA). It was assumed that grafting will provide adhesion between UHMWPE particles. UHMWPE-g-SMA and UHMWPE were mixed using a high speed homogenizer in dry form. The mixture was pure UHMWPE with 0, 3, 5, 10 and 20 wt% of UHMWPE-g-SMA. This material is denoted as UHMWPE-g 0, 3, 5, 10, 20 respectively. And then add 0.5% CNF (Carbon Nano Fiber), 0.5% Cu (nanosize) and 0.5% Al2O3 (nanosize) to their mixture. The wear resistance of UHMWPE + UHMWPE-g-SMA specimens is increased when UHMWPE-g-SMA is mixed with UHMWPE powder and nanofillers. Cu, CNF and Al2O3 nano filler were added to UHMWPE the wear intensity is rather different from UHMWPE in initial state (pure) and give rise to increase wear resistance. The results of the wear tests have shown that the highest wear resistances of each group of fillers are UHMWPE-g 3 with 0.5% Cu, UHMWPE-g 3 with 0.5% CNF and UHMWPE-g 10 with 0.5% Al2O3. However, in contrast with this result, wear resistances is increased when UHMWPE-g-SMA and nanofillers were added. In case of hardness property, hardness does not change effectively.

  • AC conductivity and dielectric properties modification of UHMWPE by graphene fillers

    In this report, a multi-layer functionalized graphene was mixed to UHMWPE. Composite samples with 0.05 wt%; 0.1 wt%; 0.15 wt% and 0.5 wt% of functionalized graphene have been manually mixed. The AC conductivity of these samples was then measured using Broadband Dielectric Spectroscopy (BDS) at low voltage. The measurements were conducted at room temperature, 40 °C, 60 °C and 80 °C, respectively. The results showed that the electrical conductivity of UHMWPE/functionalized graphene composites increased fast as the content of functionalized graphene increases from 0.15 wt%. In order to analyze the influence of the encapsulation technique, one type of sample which contains 0.05 wt% of functionalized graphene was processed by ball-milling. The dielectric responses of hand-mixed and ball-milled samples were obtained under high electric fields. The dielectric loss ε" of the hand-mixed sample at 50 Hz under 2 kV/mm was higher by a factor of 2 when compared to the corresponding ball-milled sample.

  • Tribocorrosion performance of Co/UHMWPE composite biocoatings compared to pure co coatings in a simulated physiological solution

    In this study, comparative investigation of pure Co coatings and Co/UHMWPE (ultra high molecular weight polyethylene) composite biocoatings was carried out to determine the tribocorrosion performance in a simulated physiological solution. The in situ electrochemical technique used for investigation of tribo-electrochemical degradation was the open circuit potential (OCP) measurement performed before, during and after sliding tests. The results show that the addition of the UHMWPE biopolymer microparticles into Co matrix led to an improvement tribocorrosion resistance compared to pure Co coatings intended for biomedical applications.

  • Ultra high molecular weight polyethylene (UHMWPE): Dielectric strength and space charge characteristics

    In order to replace old insulation systems based on oil-paper, other materials, such as low density polyethylene (LDPE), high density polyethylene (HDPE) and specially, cross-linked polyethylene (XLPE), have been used. Characterization of new polymeric materials potentially useful for HVDC power cables is an interesting research topic to work on. In this paper, one material whose previous applications have been far away from power engineering, has been studied: Ultra high molecular weight polyethylene (UHMWPE). Firstly, UHMWPE has been characterized in terms of statistical dielectric strength. Moreover, space charge generation and transport has been analysed in an accelerated electrical ageing experiment in order to compare UHMWPE to other polymeric materials such as XLPE or LDPE. In order to measure space charge profiles, the pulsed electro-acoustic (PEA) technique has been applied to polymer sheets withstanding more than 80kV/mm DC for more than 10 days.

  • A study of free radicals in irradiated/aged UHMWPE materials

    UHMWPE bar stock, resin powder and fibers that were irradiated with an electron beam and then stored in air for three years were investigated for long-lived free radicals. Significant concentrations of free radicals were found in all UHMWPE materials. Peroxy radicals are predominant in the UHMWPE materials that are highly accessible to oxygen, while more primary radicals remain in the UHMWPE materials that are isolated from oxygen. Based on this study, it is expected that irradiation of UHMWPE in an inert environment would result in long-lived primary radicals, which could be a potential cause of long-term oxidation. Furthermore, a highly crystalline UHMWPE may be more susceptible to long-term oxidation as more free radicals can be trapped in crystalline regions.

  • Preparation of UHMWPE microporous membranes via TIPS method and supercritical propane extraction

    In this thesis, the preparation technology of UHMWPE microporous membranes was researched via TIPS method and supercritical propane extraction when liquid paraffin(LP) was used as diluent. Under the conditions of 100°C, 9MPa, 2h, 1.5kg/h, the extraction efficiency of extracting LP is up to 98.5% and the porosity of membranes is 32.65%.

  • Mechanical and morphological behaviour of grafted UHMWPE/EVA nanoclay composites

    Generally to facilitate interaction with a polymer, clay is modified with alkyl ammonium to render the hydrophilic surface, organophilic. However, this organically modified clay does not disperse well in PE (polyethylene) due to its non-polar nature. In this paper, this dispersion is effected by blending PE with EVA (Ethyl Vinyl Acetate). UHMWPE (Ultra High Molecular Weight Polyethylene) was blended with EVA in the ratio of 90:10, 70:30 and 50:50 for imparting polar characteristics to the polyolefin. Due to the immiscibility, 5% (optimum percentage) MAH (Maleic Anhydride) was added as the compatibilizer. The nanoclay-30B was added to an optimum percentage of 3%. This blending drastically improved the mechanical and the morphological properties. This nanocomposite, owing to its elastomeric nature may be potentially used as coatings in the automobile and the marine industry.

  • Processing and Mechanical Performance of Hydroxyapatite-UHMWPE Composites

    Natural hard tissues are composed of a mineral part called hydroxyapatite (HAp), interlocked with collagen fibers. Synthetic composites based hydroxyapatite and polyethylene have been studied for the last three decades. A product with this composition has been commercialized under a trade name (HAPEX™), which is a bio-stable composite. A common problem arouse in these composites, which was the lack of chemical bonding between HAp and each of the polymers. Therefore, improving the overall properties of these composites through chemical modifying the polymeric matrix is the main objective of the current study. An injection molding technique was used to prepare composites based on commercially available hydroxyapatite and both unmodified and chemically-modified versions of UHMWPE. The proportion of HAp added was up to 25% by weight. Results reflected the high sensitivity of the produced samples to slight variations in the assembly of the injection molding as well as changing its parameters. High quality samples with excellent homogeneity were produced. This was also reflected in consistent mechanical behavior during their tensile strength measurements. Morphology of selected composites showed a homogeneous distribution of the HAp particulates in the matrix of the polymers as well as absence of phase separation.

  • Space charge properties of UHMWPE/OibPOSS composites

    POSS (Polyhedral Oligomeric SilSesquioxanes) is a type of filler of great interest in the field of polymeric micro and nanodielctrics. The thermal and mechanical properties after incorporation of POSS into polymer via chemical cross-linking or physical blending have been paid much attention to recently. In this paper, the space charge property of microstructured composites consisting of UHMWPE (ultra-high-molecular weight polyethylene) and OibPOSS (OctalsoButyl Polyhedral Oligomeric SilSesquioxanes) was studied. The high- energy shaker mill was used to obtain the composites. Briefly this paper show the space charge profiles for samples with 0wt%, 1wt%, 5wt% OibPOSS contents. The charge injection in all the samples under different applied voltages is not significant. Some homocharge can be observed from the interface between electrode and sample, only in the case of 1wt% and 5wt% composites. The charge injection and decay processing is inactive in the composites samples.

  • Effect of electroplating parameters on UHMWPE co-deposition into cobalt matrix

    The micrometer-sized ultra high molecular weight polyethylene (UHMWPE) particles (~10 μm) have been incorporated by electrochemical method with cobalt on stainless steel substrate to obtain Co/UHMWPE as a novel hybrid biocoating with applications in biocoatings, which is strongly adherent and it has thickness ranging between 15-80 μm, a challenge for plating process. The hybrid coatings have been characterized by atomic force microscopy and scanning electron microscopy equipped with an energy dispersive spectrometer (EDS) to identify chemical composition, surface morphology / topography, roughness of the coatings and inclusion percentage of UHMWPE micro-particles in the cobalt matrix. The experimental results revealed that the obtaining of Co/UHMWPE hybrid biocoatings is a promising method to enhance the surface properties of cobalt matrix. UHMWPE particles are dispersed into cobalt matrix and influence the surface morphology and roughness of hybrid layers as compared with pure cobalt.



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